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I was thinking of upgrading my phones Telstra 3G network, and go to Telstra 4G.
Will it work if I just switch sim cards or do I have to upgrade something inside the phone?
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If the phone supports your carrier’s 4G natively, just call them to enable 4G plans, there is no need to even replace the SIM card unless it is a 2G card.
If it doesn’t, there is nothing you can do to upgrade the phone, replace the phone.
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Will it work if my phone is designed and made for 3G
Of course not possible.
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